You know, they looked narrow when I saw them in the store (so I almost didn't try them on) but because of where the band over the toes falls, I think they'd work for either narrow or wide feet. They are so open-feeling that width doesn't seem to matter much (as long as one's foot fits the sole, of course). The strap around the ankle has a velcro closure, so it can be adjusted. This was key for me when I sunburnt my feet on the open kayak in Hawaii - it allowed me to wear them super loose the next day!